I am seriosly considering the Rivian on year 2 or 3, depending on how things shake out. I will not buy a year 1, and why I even waited for a 2020 RAM 1500.
That said, i do not have the spreadsheet in front of me, nor do i have real world towing vs battery drain. But my estimations have the rivian north of 20mpg pulling my 5k pound travel trailer. With the extended range batter in theory it could tow the same distance or slighlty more than my 33 gallon tank.
I still have work to do determining if EV is right for me, and with the GMC announcment, that adds another layer.
I do find this thread commical though, there are a ****ton of 5.7 HEMI on the road, remember they are in cars, trucks, suv...